package chapter10;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

import java.sql.*;
import java.util.Scanner;

public class demo1 {
    /**
     * 模拟添加用户业务
     */
    public static  void main(String[] args) throws SQLException{
        Statement stmt = null;
        ResultSet rs = null;
        Connection conn = null;
        try {
            //1.注册数据库驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            //2.通过DriverManger获取数据库连接
            String url = "jdbc:mysql://localhost:3306/jdbc?serverTimezone=GMT%2B8&useSSL=false";
            String username = "root";//数据库账户
            String password = "123456";
            conn = DriverManager.getConnection(url,username,password);
            //3.通过Connection对象获取Statement对象
            stmt = conn.createStatement();
            //4.使用Statement执行SQL语句
            /**
             * 终端用户输入用户名 密码 邮箱
             * 将终端用户的输入添加到数据库
             */
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入用户名：");
            String un = sc.next();
            System.out.println("请输入用户密码");
            String pd = sc.next();
            System.out.println("请输入用户邮箱");
            String em = sc.next();
            String insertSQL = "insert into users(name,password,email) values(?,?,?)";
            PreparedStatement pm = conn.prepareStatement(insertSQL);//对插入sql进行处理了
            pm.setString(1,un);
            pm.setString(2,pd);
            pm.setString(3,em);
            pm.executeUpdate();
            String sql= "select * from users";
            rs = stmt.executeQuery(sql);
            //5.操作ResultSet结果集
            System.out.println("id |   name  |   password"+"  |   email    |   birthady");
            while (rs.next()){
                int id = rs.getInt("id");//通过列名获取指定字段的值
                String name = rs.getString("name");
                String psw = rs.getString("password");
                String email = rs.getString("email");
                Date birthday = rs.getDate("birthday");
                System.out.println(id + "    |   "+ name+   "|   "+ psw + "  |   "+ email + "  |     " + birthday);
            }
        }catch (ClassNotFoundException e){
            e.printStackTrace();
        }finally {
            //6.回收数据库资源
            if (rs !=null){
                try {
                    rs.close();
                } catch (SQLException e){
                    e.printStackTrace();
                }
                rs= null;
            }
            if (stmt != null){
                try{
                    stmt.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
                stmt = null;
            }
            if (conn !=null) {
                try {
                    conn.close();
                } catch (SQLException e){
                    e.printStackTrace();
                }
                conn = null;
            }
        }
    }
}
